1. Department of Chemical and Energy Engineering, Curtin University Malaysia, CDT 250, Miri 98009, Sarawak, Malaysia
2. Department of Materials and Metallurgical Engineering, Amirkabir University of Technology, Tehran 15875-4313, Iran
3. Discipline of Chemical Engineering, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa